Warming: flowers on an apple tree in summer, 30 August !!

[Paul]

Hello,
this morning I look out the window and what do I see?
an apple tree has flowers! ': shock:' so that we are late August and it is full of apple!

Normal??

[the middle]

Mouai, I also have a plant that only gives flowers in spring, and now it starts again a second time ...

[dedeleco]

In the longest days, the 30 August, it's the same as the April 10, and if a cold cheat occurred before, the buds believe in spring in April and after the winter and bloom! !!
Same sometimes also in October - November on trees that leave their leaves !!!!

[Paul]

That's true why did not I think about it earlier,
actually it was a little cold last week for a month of August.
they have no calendar the plants it is quite logical.
thank you for this obvious reminder
a+

[elephant]

the question (and its answer) were in any case interesting. I also asked myself the question.

[dedeleco]

Plants, mushrooms, animals, birds, mammals and even us, have a calendar based on the length of the day and there are plenty of studies on biological clocks that measure this length of the day, essential for many , to bloom or leave the leaves, at the right time without getting caught in the weather very variable and misleading temperatures !!!!
So the length of the day regulates the calendar and even to the day, like the tricholoma of the Saint George 23 April pîle in my garden formerly (it ended up disappearing after exhausting the soil)
http://fr.wikipedia.org/wiki/Tricholome ... nt-Georges
And the autumn spring distinction is not always made by plants that bloom like dimorphotheca in spring and fall alike:
http://www.plantes.ca/fleurs/famille/osteospermum.html
http://www.graines-caillard.com/produit ... product=47
http://lesbeauxjardins.com/jardinons/an ... thecas.htm
They are perennial for many years but do not tolerate frost and resevere themselves perpetually.

The distinction is made by the memory of cold or hot past essential for some fruits or leaves.

[Did67]

Just to complete:

a) some plants are "photoperiodic" = sensitive to the length of the day (biologically, it is rather a sensitivity to the length of the night) ...

- not tropical, otherwise they would never flower (at the equator, the duration of the day is almost constant)

the well known cases are chrysanthemums, and full of bulbous ...

[we can therefore "force" them by obscuring]

b) others need "vernalization" = need a certain quantity of cold (at a time, temperature which drops below a minimum, for a certain duration)

- not in the tropics, because there is no cold, it is often the dry season which "regulates" the plants!

- frequent cases, it's cacti!

c) others, it's the drought ...

- case of certain orchids (Cymbidium), of the clivia ... but you can "accelerate" or increase the flowering of many plants by a hdyric stress - water little or not at all during a certain period ...

And a lot of plants, it's a bit of all of this together.

There, in this case, I suspect both the drought period and then the wet cold.

NB: Flowering at the same time as fruiting is common in some plants: cacao for example.

[dedeleco]

And there are even plants, after stress, which bloom and fructify strongly, just before dying !!
Case of a apricot with delicious apricots at home, dead after !!
Agaves do this to 15 at 30 years of age and die !!

[antoinet111]

a large number of bamboos also die after flowering and fruiting.

[Christine]

With the beautiful late seasons that we have had for a few years, the plants also tend to "rise" longer. Ex: roses which still bloom at the end of September, October in our climate which is usually more "stony".